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The article reports on the study conducted by R. J. Stockdale and colleagues on measuring river velocities using global positioning system (GPS) River Flow Tracers, commonly known as GRiFTers, in Great Britain. It reveals that more than 10,000 measurements were made in a three hour period and aggregated over a two meters grid to generate a genuine distributed representation of flow across the reach. The tool is used in measuring surface flow velocities in a 400 meters reach of the River Swale because it allows the rapid collection of spatially distributed, highly detailed surface velocity data. Researchers found an interesting insights into spatial variations in flow and longitudinal flow structures such as riffle-pool sequences.

Objectives: To compare the effectiveness of four falls risk assessment tools (STRATIFY, Downton, Tullamore, and Tinetti) by using them simultaneously in the same environment., Design: Prospective, open, observational study., Setting: Two acute medical wards admitting predominantly older patients., Participants: One hundred thirty-five patients, 86 female, mean age+/-standard deviation 83.8+/-8.01 (range 56-100)., Measurements: A single clinician prospectively completed the four falls risk assessment tools. The extent of completion and time to complete each tool was recorded. Patients were followed until discharge, noting the occurrence of falls. The sensitivity, specificity, negative predictive accuracy, positive predictive accuracy, and total predictive accuracy were calculated., Results: The number of patients that the STRATIFY correctly identified (n=90) was significantly higher than the Downton (n=46; P<.001), Tullamore (n=66; P=.005), or Tinetti (n=52; P<.001) tools, but the STRATIFY had the poorest sensitivity (68.2%). The STRATIFY was also the only tool that could be fully completed in all patients (n=135), compared with the Downton (n=130; P=.06), Tullamore (n=130; P=.06), and Tinetti (n=17; P<.001). The time required to complete the STRATIFY tool (average 3.85 minutes) was significantly less than for the Downton (6.34 minutes; P<.001), Tinetti (7.4 minutes; P<.001), and Tullamore (6.25 minutes; P<.001). The Kaplan-Meier test showed that the STRATIFY (log rank P=.001) and Tullamore tools (log rank P<.001) were effective at predicting falls over the first week of admission. The Downton (log rank P=.46) and Tinetti tools (log rank P=.41) did not demonstrate this characteristic., Conclusion: Significant differences were identified in the performance and complexity between the four risk assessment tools studied. The STRATIFY tool was the shortest and easiest to complete and had the highest predictive value but the lowest sensitivity.